<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:drawable="@drawable/sign_btn_blue" android:state_window_focused="false"/>

    <item android:drawable="@drawable/sign_btn_blue_sell" android:state_focused="true"/>
    <item android:drawable="@drawable/sign_btn_blue_sell" android:state_pressed="true"/>
    <item android:drawable="@drawable/sign_btn_blue" android:state_pressed="true"/>

</selector>